I didn't say that only Germans had this technology. They have been doing a heavy research though and they didn't have to worry about human rights abuse and so on. It was valuable enough so that it was worth for the US to launch Operation Paperclip.
Sure but I'm not sure how their freedom from worrying about human rights abuse has anything at all to do with their rocket research. They never had any human test pilots or manned rocket vehicle tests (that are public record anyway). Perhaps, you confusing that with their medical research.
It's like when people gave credit to Hitler for infrastructure projects such as the Autobahns which were already in progress before he took office.